twisted/internet/test/test_main.py

   1 # Copyright (c) Twisted Matrix Laboratories.
   2 # See LICENSE for details.
   3
   4 """
   5 Tests for L{twisted.internet.main}.
   6 """
   7
   8 from twisted.trial import unittest
   9 from twisted.internet.error import ReactorAlreadyInstalledError
  10 from twisted.internet.main import installReactor
  11
  12
  13 class InstallReactorTests(unittest.TestCase):
  14     """
  15     Tests for L{installReactor}
  16     """
  17
  18     def test_alreadyInstalled(self):
  19         """
  20         If a reactor is already installed, L{installReactor} raises
  21         L{ReactorAlreadyInstalledError}.
  22         """
  23         # Because this test runs in trial, assume a reactor is already
  24         # installed.
  25         self.assertRaises(ReactorAlreadyInstalledError, installReactor,
  26                           object())
  27
  28
  29     def test_errorIsAnAssertionError(self):
  30         """
  31         For backwards compatibility, L{ReactorAlreadyInstalledError} is an
  32         L{AssertionError}.
  33         """
  34         self.assertTrue(issubclass(ReactorAlreadyInstalledError,
  35                         AssertionError))
  36
  37
  38